Ventilatoe



` UNITED sTATEs PATENT oEEioE.

T. C'. HATCH, OF'SOUTI-I BRAINTREE, MASSACHUSETTS. e

VENTILATOR. i

Specicaton ofLetters Patent No. 8,167, dated June 17, 1851.

. such parts as I claim and desire to have secured to me by LettersPatent. y.

My new ventilator is so arranged, that from whatever quarter vthe windblows,none can blow down the chimney or whatever otheroriice theventilator may be attached to, but on the contrary the draft isincreased, while, at the same time,` it eifectually prevents all rainetc. from entering.

My improved i ventilator is constructed with two series or sets of slatsarranged one within the other, thespaces left between the outer slatsbein occupied `by those of the inner set, andtie edges of the outerslatsV extending a little over those of the inner ones, leaving a spaceor opening sidewise be'- tween the two. These several slats are bent orcurved into aconical orglobular form, both sets approaching a smallcircle over the center of the flue. The wind, asit impinges upon theoblique and curved slats, is thrown olf in all directions, thus tendingto draw off thestill air from the flue and producing a partial vacuumbetween the slats, and, by the curved form of these slatsthe wind isthrown olf in an upward as well as sidewise direction, thus drawing offthe air from the Hue in the most natural manner, namely, upward.

`My improvements are represented in the accompanying plate of drawings.e

Figure 1 is a plan or top view of my improved ventilator." Fig. 2 is avertical section taken in the plane of the line B, Fig. l.

a a a 0L` in the drawings represents `the chimney on which theventilator is placed. i

b, etc., are the outer slats running from near the edge of the chimneyto the small circle or plate cion the top of the ventilator, these slatsbeing curved as shown in the drawings.

d, d, etc., are the inner slats, shown in Fig. y

2 and by dotted lines in Fig. 1, running to thesame circle o and beingcurved in the `same manner as the outer slats; but they do not run sonear to the outer edge of the chimney as the slats b, and consequentlyleave the aperture or spaces f, f, etc., between theinner` and outerslats. The inner slats d, d, etc., are so placed as to occupy the spacesleft between the several outer slats,

and, as the edges of the exterior slats lap or project over those of theinner slats, no wind can be blown into the flue or orifice, the onlyopenings being in an oblique or sidewise direction. i

It will be seen that the globular form or curve given to theslats, tendsto diffuse the air in all directions and particularly upward, therebyhaving a greater tendency to produce a vacuum and consequently toincrease the draft, than if they were arranged in an upright or anyotherposition.

Having thus described my improvements in ventilators, I shall state myclaim as follows.- M

What I claim as my invention and desire to have secured to me by LettersPatent is,

A ventilator, as herein above described, composedof two series or setsof curved slats, arranged one within theother, and

runningfrom the edge of the flue or other orifice to a small circle orplate over the center of the same, the whole forming a `conical or globeshaped ventilator. the spaces between the several outer slats, beingprotected by the innerslats, leaving spaces or apertures` between thetwo sets of slats,

` the only openings to said apertures being in an oblique or sidewisedirection, all as here in above described and set forth.

e THATCHER o. HATCH. Witnesses: i `J. F. DEARBORN,

`SHUEART Gr. EDMoNDs.

